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HELLEN MAI NGUYEN DO
NPI 1134810724
Family Medicine in Pomona, CA

Active since May 16, 2023PECOS Enrolled
309 E 2ND ST, POMONA, CA 91766(909) 469-5589 Get Directions Write a Review

NPPES record last updated: June 18, 2026. Verified against the NPPES registry weekly; last sync: August 23, 2026.

Record update history: Apr 8, 2026, May 16, 2023 (2 updates tracked since 2023).

About Hellen Mai Nguyen Do NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

HELLEN MAI NGUYEN DO (NPI 1134810724) is an individual family medicine provider in Pomona, California, licensed in Washington (OL70114003) and active in the NPI registry since May 2023. She is enrolled in Medicare PECOS and maintains a secondary practice location in Yakima.

NPPES Registry Identity

NPI1134810724
Entity TypeIndividualFemale
Primary Taxonomy207Q00000X
Provider Legal NameHELLEN MAI NGUYENCredential: DO
Location Address309 E 2ND STPomona, CA 91766-1854
Mailing Address501 S 5th AveYakima, WA 98902-3550 · (509) 853-1082 · Fax (509) 573-6275
Phone(909) 469-5589
Sole ProprietorNo
Enumeration DateMay 16, 2023
Last NPPES UpdateJune 18, 20262 updates tracked since enumeration
NPPES CertifiedJune 18, 2026
✔ NPI 1134810724 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
License✔ Licensed in WA · OL70114003
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X · License OL70114003 (WA)
309 E 2ND ST, Pomona, CA 91766
Open in Google Maps ↗

Secondary Practice Location 1

Location 11806 W Lincoln AveYakima, WA 98902-2473 · Phone (509) 452-4520 · Fax (509) 452-5224

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Hellen Mai Nguyen Do is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 91766 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$96.36 typical visit price
range $62.96 – $187.60
Typical copayment $24.09 (range $15.74 – $46.90)
Most-billed visit code 99203
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

NANCY IRENE NIELSEN-BROWN PA-C
Physician Assistant (Medical)
309 E 2ND ST
POMONA, CA 91766
Los Angeles County (909) 469-5386
BRITTNEY TUNON
Physician Assistant
309 E 2ND ST
POMONA, CA 91766
Los Angeles County (703) 955-6286
MR. EVAN HERSHMAN
Student in an Organized Health Care Education/Training Program
309 E 2ND ST
POMONA, CA 91766
Los Angeles County (909) 469-5589
CHAU MINH NGUYEN PA-C
Physician Assistant
309 E 2ND ST
POMONA, CA 91766
Los Angeles County (951) 892-4858
AMI PATEL
Student in an Organized Health Care Education/Training Program
309 E 2ND ST
POMONA, CA 91766
Los Angeles County (909) 469-5589
MR. FOUAD HAJJAR
Student in an Organized Health Care Education/Training Program
309 E 2ND ST
POMONA, CA 91766
Los Angeles County (909) 469-5589
THAO BICH VU
Student in an Organized Health Care Education/Training Program
309 E 2ND ST
POMONA, CA 91766
Los Angeles County (909) 469-5589
JULIA B DIAMANT
Student in an Organized Health Care Education/Training Program
309 E 2ND ST
POMONA, CA 91766
Los Angeles County (909) 469-5589

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Hellen Nguyen's NPI number?

The NPI number for Hellen Nguyen is 1134810724. It was assigned to this individual provider in the NPPES registry on May 16, 2023.

Where is Hellen Nguyen located?

Hellen Nguyen practices at 309 E 2nd St, Pomona, CA 91766. The listed phone number is (909) 469-5589.

What is Hellen Nguyen's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is Hellen Nguyen enrolled in Medicare?

Yes. Hellen Nguyen is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Hellen Nguyen was last updated on June 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.